247961 has 4 divisors (see below), whose sum is σ = 283392. Its totient is φ = 212532.

The previous prime is 247957. The next prime is 247991. The reversal of 247961 is 169742.

247961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169742 = 2 ⋅84871.

It is a cyclic number.

It is not a de Polignac number, because 247961 - 2² = 247957 is a prime.

It is a super-2 number, since 2×247961² = 122969315042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 247961.

It is not an unprimeable number, because it can be changed into a prime (247901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17705 + ... + 17718.

It is an arithmetic number, because the mean of its divisors is an integer number (70848).

2²⁴⁷⁹⁶¹ is an apocalyptic number.

It is an amenable number.

247961 is a deficient number, since it is larger than the sum of its proper divisors (35431).

247961 is an equidigital number, since it uses as much as digits as its factorization.

247961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35430.

The product of its digits is 3024, while the sum is 29.

The square root of 247961 is about 497.9568254377. The cubic root of 247961 is about 62.8243194922.

The spelling of 247961 in words is "two hundred forty-seven thousand, nine hundred sixty-one".